Extensor Digitorum Communis
Extensor Digitorum Communis is sometimes simply referred to as Extensor Digitorum. It is one of the extensor muscles of the wrist, found in the forearm.
Origin
- Lateral epicondyle of the humerus.
Insertion
- Splits into 4 tendons which insert to the bases of the 2nd and 3rd Phalanges of the four fingers.
Actions
- Extension of the wrist.
- Extension of the fingers.
Innervation
- Posterior interosseous nerve.
Daily uses
- Pulling the hand back and straightening the fingers to wave.
Example strengthening exercises
- Wrist extension using a resistance band.
Example stretches
- Wrist extensor stretch.
Related injuries
- Tennis elbow.
Related muscles
- Extensor carpi ulnaris.
- Extensor carpi radialis brevis.
- Extensor carpi radialis longus.
- Extensor pollicis longus.
